Passive transport, NaOH vs. NH3

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Risco
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Passive transport, NaOH vs. NH3

Post by Risco » Wed Mar 08, 2006 9:39 am

Made some experiments last week in school concerning passive transport through yeast cells. The experiment involved NH3 and NaOH and apparently only the NH3 could enter the cells. The question is: How can this happen? Both molecules are polar right?

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MrMistery
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Post by MrMistery » Wed Mar 08, 2006 6:38 pm

Hmmm... How did you realise that the NaOH didn't enter the cell? Maybe the Na channels were simply closed?
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Risco
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Post by Risco » Thu Mar 09, 2006 4:12 pm

Ah, we used som neutral red on the cells to discover any change in pH.
Yes I thought of that as well, but it seemed too simple. :)

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?

Post by hicindy1989 » Sat Mar 11, 2006 3:58 pm

:shock:

NH3 is not a polar compound. Only if it binds H2O

NH3+H2O--NH4+ + OH-

but not every NH3 binds H2O

because it is a weak base



but!!
NaOH is totally different.
It's a strong base.
So all the molecules will hydrolyze into Na+ & OH-

they are electrified

so it can not go through the cell membrane


Well. I guess...If it is wrong, plz tell me :D

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mith
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Post by mith » Sat Mar 11, 2006 10:48 pm

NH3 is polar because there is actually an unbonded pair...it becomes nonpolar when it's NH4
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Post by MrMistery » Sun Mar 12, 2006 9:48 am

So in NH4 there is an extra coordinative bond?
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